Question: What is the position held by Benito Pérez Galdós whose electoral district is Guayama?
Paraphrase: What office does Benito Perez Galdos hold in the electoral district of Guayama?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q189869 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P768 wd:Q1870997 }